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Review Question - QID 213606

In scope icon M 7 B
QID 213606 (Type "213606" in App Search)
A 55-year-old man presents to the emergency department with fatigue and weakness. His symptoms started a week ago and have been gradually worsening. The patient can’t recall any precipitating events or illnesses. The patient has a past medical history of diabetes and hypertension. His temperature is 99.4°F (37.4°C), blood pressure is 97/58 mmHg, pulse is 120/min, respirations are 17/min, and oxygen saturation is 98% on room air. Physical exam is notable for a pale and fatigued appearing man. Rectal exam reveals black stool that is guaiac positive. Laboratory values are drawn as seen below.

Hemoglobin: 6.8 g/dL
Hematocrit: 20%
Leukocyte count: 6,500/mm^3 with normal differential
Platelet count: 197,000/mm^3

Which of the following is the best next step in management?